CN218513616U

CN218513616U - Secondary battery cover plate structure and secondary battery

Info

Publication number: CN218513616U
Application number: CN202221986971.4U
Authority: CN
Inventors: 陶枝南; 刘宏勇; 于哲勋
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2023-02-21
Anticipated expiration: 2032-07-29

Abstract

The utility model relates to the field of energy storage devices, and discloses a secondary battery cover plate structure and a secondary battery, which comprise a heat-conducting insulating cover plate and a pole component arranged on the heat-conducting insulating cover plate; the pole component comprises a connecting plate and a conductive piece, the connecting plate is used for connecting a pole lug, the conductive piece is connected with the connecting plate, and the connecting plate is attached to one side of the bottom of the heat-conducting insulating cover plate. The secondary battery cover plate structure and the secondary battery of the embodiment improve the heat dissipation effect of the secondary battery, and are favorable for avoiding the situation that the secondary battery is locally overheated.

Description

Secondary battery cover plate structure and secondary battery

Technical Field

The utility model relates to an energy storage device field especially relates to a secondary battery covers plate structure and secondary battery.

Background

The temperature rise speed of the secondary battery is high when the secondary battery is charged quickly, and the performance of the secondary battery is influenced and certain safety risk also exists when the temperature of the secondary battery is high. Therefore, how to dissipate heat of the secondary battery becomes extremely important.

At present, the secondary battery is quickly charged, the place with larger heat productivity mainly concentrates on the joint of a battery core lug and a pole column to generate heat greatly, the joint and a top cover are mutually separated, an insulating partition plate is arranged between the joint and the top cover, and the heat of the joint is difficult to transfer to the top cover, so that the situation that the local temperature of the secondary battery is too high easily occurs.

In view of the above, a secondary battery cover plate structure and a secondary battery are needed to improve the heat dissipation effect of the secondary battery and prevent the secondary battery from being locally overheated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a secondary battery cover plate structure and secondary battery solve above problem.

To achieve the purpose, the utility model adopts the following technical proposal:

a secondary battery cover plate structure comprises a heat-conducting insulating cover plate and a pole assembly arranged on the heat-conducting insulating cover plate;

the pole component comprises a connecting plate used for connecting a pole lug and a conductive piece connected with the connecting plate, and the connecting plate is attached to one side of the bottom of the heat-conducting insulating cover plate.

Optionally, the heat-conducting insulating cover plate is an aluminum nitride ceramic plate, an aluminum oxide ceramic plate or an electrically-conducting polyphenylene sulfide plate.

Optionally, the heat-conducting insulating cover plate is provided with a mounting through hole, an annular fixing plate is arranged on an inner hole wall of the mounting through hole, and the annular fixing plate is provided with a first plate surface and a second plate surface which are arranged oppositely;

the connecting plate is attached to the first plate surface;

the conductive piece comprises a mounting plate part attached to the second plate surface and a connecting part extending into the mounting through hole and connected with the connecting plate in a welded mode.

Optionally, a gap between the connecting plate and the first plate surface is provided with a sealant;

and a gap between the mounting plate part and the second plate surface is provided with a sealant.

Optionally, a mounting groove for plug-in connection with the shell is formed in the bottom surface of the heat-conducting insulating cover plate, and the mounting groove is connected end to end;

and a sealing ring is arranged in the mounting groove.

Optionally, the mounting through hole is circular or rectangular, and the cross-sectional shape of the connecting portion matches the shape of the mounting through hole.

Optionally, the area of the bottom surface of the connecting plate is a, the area of the bottom surface of the heat-conducting insulating cover plate is B, and 0.2-woven fabric A/B <0.45 is adopted.

Optionally, still be provided with the pressure release on the heat conduction insulating cover plate and annotate integrative structure of liquid, the integrative structure of liquid is annotated in the pressure release include the recess that sets up on the heat conduction insulating cover plate annotate the liquid hole of seting up on the tank bottom of recess, be used for sealing annotate the rubber in liquid hole and be used for sealing the glue layer of recess.

Optionally, the heat-conducting insulating cover plate is provided with two pole assemblies at intervals, one of the pole assemblies is connected with the positive pole lug, and the other of the pole assemblies is connected with the negative pole lug.

A secondary battery comprises the secondary battery cover plate structure as described in any one of the above.

Compared with the prior art, the utility model discloses following beneficial effect has:

in this embodiment, heat conduction insulation cover plate is insulating and can lead the hot plate, and the connecting plate is laminated on heat conduction insulation cover plate, and when connecting plate and utmost point ear junction were generated heat, the heat can be fast through the connecting plate transmit to heat conduction insulation cover plate on, then heat conduction insulation cover plate with heat transfer to external world or in the cooling part to can reach quick radiating effect, promote secondary battery's radiating effect, be favorable to avoiding secondary battery the local overheated condition to appear.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose.

Fig. 1 is an exploded schematic view of a secondary battery cover plate structure according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a secondary battery cover plate structure according to an embodiment of the present invention;

FIG. 3 isbase:Sub>A schematic cross-sectional view taken along line A-A of the structure of the secondary battery cover plate in FIG. 2;

FIG. 4 is an enlarged schematic view of position A of FIG. 3;

FIG. 5 is an enlarged schematic view of position B of FIG. 3;

fig. 6 is a schematic cross-sectional view of a conductive device according to an embodiment of the present invention.

Illustration of the drawings: 1. a thermally conductive and insulating cover plate; 101. mounting grooves; 102. a groove; 11. mounting a through hole; 12. An annular fixed plate; 2. a pole assembly; 21. a connecting plate; 22. a conductive member; 221. a mounting plate portion; 222. A connecting portion; 3. and (5) sealing rings.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. It should be noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Example one

The embodiment of the utility model provides a secondary battery covers plate structure can effectively promote secondary battery radiating effect.

Referring to fig. 1 to 6, the secondary battery cover plate structure includes a heat conductive insulating cover plate 1 and a post assembly 2 mounted on the heat conductive insulating cover plate 1. The heat-conducting insulating cover plate 1 is a plate that is insulating and can conduct heat. The thermal conductivity of the heat-conducting insulating cover plate 1 is more than 1.0W/m.K.

The pole assembly 2 comprises a connecting plate 21 for connecting a pole lug and a conductive piece 22 for connecting the connecting plate 21, and the connecting plate 21 is attached to one side of the bottom of the heat-conducting insulating cover plate 1. The conductive member 22 is conductively connected to the connection plate 21.

Specifically, the connection plate 21 is pasted on the heat-conducting insulating cover plate 1, and when the junction of the battery core tab and the connection plate 21 generates heat, the heat can be rapidly transmitted to the heat-conducting insulating cover plate 1, and then the heat-conducting insulating cover plate 1 gives off the heat to the outside, so as to avoid excessive heat in the secondary battery.

Preferably, a cooling pipe or other cooling device may be disposed on the top surface of the heat conducting insulating cover plate 1 to further enhance the heat dissipation effect. The embodiment can effectively improve the efficiency of transferring the heat inside the secondary battery to the heat-conducting insulating cover plate 1, avoid the overhigh heat inside the secondary battery and improve the heat dissipation effect of the secondary battery.

Alternatively, the thermally conductive insulating cover plate 1 is an aluminum nitride ceramic plate, an aluminum oxide ceramic plate, or an electrically conductive polyphenylene sulfide plate. It should be noted that the aluminum nitride ceramic plate, the aluminum oxide ceramic plate, or the conductive polyphenylene sulfide plate has a good insulating effect and a high thermal conductivity, and can effectively improve the heat dissipation effect of the secondary battery.

Optionally, the heat-conducting insulating cover plate 1 is provided with a mounting through hole 11, an annular fixing plate 12 is arranged on an inner hole wall of the mounting through hole 11, and the annular fixing plate 12 has a first plate surface and a second plate surface which are arranged oppositely; the connecting plate 21 is attached to the first plate surface; the conductive member 22 includes a mounting plate portion 221 attached to the second plate surface and a connecting portion 222 extending into the mounting through hole and connected to the connecting plate 21 by welding.

Specifically, the connecting plate 21 and the conductive member 22 clamp the annular fixing plate 12, thereby fixing the pole assembly 2 to the heat-conductive insulating cover plate 1. In addition, the contact area between the heat-conducting insulating cover plate 1 and the pole component 2 is larger, so that heat conduction and heat dissipation are facilitated, and the heat dissipation effect of the secondary battery is further improved.

Optionally, a sealant is arranged in a gap between the connecting plate 21 and the first plate surface; the gap between the mounting plate portion 221 and the second plate surface is provided with a sealant, and the sealant has a sealing effect, so that the sealing performance of the secondary battery can be effectively improved.

Optionally, a mounting groove 101 for plug-in connection with the shell is formed in the bottom surface of the heat-conducting insulating cover plate 1, and the mounting groove 101 is connected end to end; the mounting groove 101 is provided with a sealing ring 3. The casing of secondary battery can be inserted to the mounting groove and realize the plug-in connection between casing and the heat conduction insulation cover plate 1, and sealing washer 3 makes and keeps sealed between casing and the heat conduction insulation cover plate 1.

Alternatively, the mounting through-hole 11 has a circular or rectangular shape, and the cross-sectional shape of the connecting portion 222 matches the shape of the mounting through-hole 11. The side wall of the connecting portion 222 abuts against the inner wall of the mounting through hole.

In one embodiment, the area of the bottom surface of the connection plate 21 is a, the area of the bottom surface of the heat-conducting insulating cover plate 1 is B, and a/B =0.4. It should be noted that 0.2-woven fabric A/B <0.45, and the value of A/B is in this value range, the heat conduction effect of the structure of the secondary battery cover plate is better.

Optionally, the heat-conducting insulating cover plate 1 is further provided with a pressure-relief liquid-injection integrated structure, and the pressure-relief liquid-injection integrated structure includes a groove 102 formed in the heat-conducting insulating cover plate 1, a liquid-injection hole formed in the bottom of the groove 102, rubber for sealing the liquid-injection hole, and a glue layer for sealing the groove 102. After annotating the liquid and accomplishing, the rubber is sealed annotating the liquid hole, then pours into glue in recess 102 in order to form the glue layer, and the glue layer can play the secondary sealed effect, promotes the leakproofness of annotating the liquid hole. In the use process of the battery, when thermal runaway occurs, the rubber can be softened or even cracked, and after the rubber sealing of the glue layer fails, the glue layer is melted at high temperature or broken by air pressure, so that the battery can be timely decompressed. In this embodiment, only need be provided with the pressure release on heat conduction insulation cover plate 1 and annotate liquid body structure, need not set up the notes liquid structure and the explosion-proof structure of alternate segregation, be favorable to increasing connecting plate 21 and heat conduction insulation cover plate 1's area of contact to promote the radiating effect of battery cover plate structure.

Optionally, the heat-conducting insulating cover plate 1 is provided with two pole assemblies 2 at intervals, one pole assembly 2 is connected with the positive electrode tab, and the other pole assembly 2 is connected with the negative electrode tab.

Example two

The present embodiment discloses a secondary battery including a secondary battery cover plate structure as in the first embodiment. The secondary battery also comprises a shell, a battery cell arranged on the shell and other necessary components. The battery core extends out of a tab to be connected with the connecting plate 21. Preferably, the tabs are welded to the connection plate 21.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A secondary battery cover plate structure is characterized by comprising a heat-conducting insulating cover plate (1) and a pole assembly (2) arranged on the heat-conducting insulating cover plate (1);

utmost point post subassembly (2) are including being used for connecting the connecting plate (21) of utmost point ear and connecting electrically conductive (22) of connecting plate (21), electrically conductive be used for with outside electricity and be connected, connecting plate (21) laminate in bottom one side of heat conduction insulation cover plate (1).

2. The secondary battery cover plate structure according to claim 1, wherein the thermally conductive insulating cover plate (1) is an aluminum nitride ceramic plate, an aluminum oxide ceramic plate, or an electrically conductive polyphenylene sulfide plate.

3. The secondary battery cover plate structure according to claim 1, wherein the heat-conducting insulating cover plate (1) is provided with a mounting through hole (11), an annular fixing plate (12) is arranged on an inner hole wall of the mounting through hole (11), and the annular fixing plate (12) has a first plate surface and a second plate surface which are oppositely arranged;

the connecting plate (21) is attached to the first plate surface;

the conductive piece (22) comprises a mounting plate part (221) attached to the second plate surface and a connecting part (222) extending into the mounting through hole (11) and connected with the connecting plate (21) in a welding mode.

4. The secondary battery cover plate structure according to claim 3, wherein a sealant is disposed in a gap between the connection plate (21) and the first plate surface;

and a sealant is arranged in a gap between the mounting plate part (221) and the second plate surface.

5. The secondary battery cover plate structure according to claim 1, wherein a mounting groove (101) for plug connection with a housing is formed in the bottom surface of the heat-conducting insulating cover plate (1), and the mounting groove (101) is connected end to end;

and a sealing ring (3) is arranged in the mounting groove (101).

6. The secondary battery cover plate structure according to claim 3, wherein the mounting through-hole (11) has a circular or rectangular shape, and the connection part (222) has a cross-sectional shape matching the shape of the mounting through-hole (11).

7. The secondary battery cover plate structure according to claim 1, wherein the area of the bottom surface of the connection plate (21) is a, the area of the bottom surface of the thermally conductive and insulating cover plate (1) is B, and 0.2-inch a/B <0.45.

8. The secondary battery cover plate structure according to claim 1, wherein a pressure relief and liquid injection integrated structure is further arranged on the heat-conducting insulating cover plate (1), and the pressure relief and liquid injection integrated structure comprises a groove (102) arranged on the heat-conducting insulating cover plate (1), a liquid injection hole formed in the bottom of the groove (102), rubber for sealing the liquid injection hole, and a glue layer for sealing the groove.

9. The secondary battery cover plate structure according to claim 1, wherein two pole assemblies (2) are arranged on the heat-conducting insulating cover plate (1) at intervals, one pole assembly (2) is connected with a positive pole lug, and the other pole assembly (2) is connected with a negative pole lug.

10. A secondary battery comprising the secondary battery cover plate structure according to any one of claims 1 to 9.